126 MR. F. W. HARMER ON THE GLACIAL DEPOSITS 
Crag, no doubt, is sometimes pebbly, and as we have seen, 
the Middle Glacial contains pebbles in certain places. In 
both cases, however, I think they may be derivative. It is 
not always possible to ascertain the exact stratigraphical 
position of beds of unfossiliferous gravel, and shingle like 
that at Westleton may not be everywhere of the same age. 
Still I believe there was a “ Westleton ” stage in East 
Anglia, and that it should be grouped with the Lower Glacial 
series. 
The Middle Glacial Sands. 
A reference to the East Anglian maps of the Geological 
Survey, sheets 12 and 16 of the (Drift) series being 
the most convenient for the purpose, will show that a con- 
siderable area in East Norfolk, roughly coinciding with that 
to the east of a line drawn from Wells to Norwich, 
and practically that of the North Sea Drift, is covered 
by fine sands ( Ig of the Survey Map and coloured pink), 
and No. 8 (coloured yellow) of the map published by 
Wood and myself in 1872.* These sands overlie the North 
Sea brick-earth (the Contorted Drift in its uncontorted 
form), and belong to the earlier glaciation. To the south 
of the Cromer ridge, and to the north of Norwich they 
form flat sandy heaths, as to the east of Attlebridge and 
elsewhere, having probably been due to the flood water 
which issued from the North Sea ice-sheet during its retreat, 
corresponding to the “ sand plains ” of Scandinavian geologists. 
By the kindness of Prof. Ussing I am able to give a repro- 
duction of a photograph of one of the latter from the interior 
of Jutland (fig. 7). 
With these sands were grouped, both by the Geological 
Survey and by Wood and myself, beds of a similar character, 
sometimes becoming gravelly, which extend to the south 
of Norwich into Suffolk and Essex. 
These, however, underlie and are associated with the Chalky 
boulder- clay, and not with the North Sea Drift. As a rule 
* Supp. Crag Moll., Palaeont. Soc., 1872. 
